Improve icmp handling if MULTINIC enabled. From Max Neklyudov

net/netdev/netdev.h

@@ -130,6 +130,7 @@ FAR struct net_driver_s *netdev_default(void);
 #ifdef CONFIG_NET_IPv4
 #  ifdef CONFIG_NETDEV_MULTINIC
 void netdev_ipv4_txnotify(in_addr_t lipaddr, in_addr_t ripaddr);
+void netdev_ipv4_txnotify_dev(FAR struct net_driver_s *dev);
 #  else
 void netdev_ipv4_txnotify(in_addr_t ripaddr);
 #  endif

net/netdev/netdev_ioctl.c

@@ -65,6 +65,7 @@
 
 #include "socket/socket.h"
 #include "netdev/netdev.h"
+#include "devif/devif.h"
 #include "igmp/igmp.h"
 #include "icmpv6/icmpv6.h"
 #include "route/route.h"
@@ -1024,7 +1025,7 @@ void netdev_ifup(FAR struct net_driver_s *dev)
 
 void netdev_ifdown(FAR struct net_driver_s *dev)
 {
-  /* Make sure that the device supports the d_ifdown() method */
+  /* Check sure that the device supports the d_ifdown() method */
 
   if (dev->d_ifdown)
     {
@@ -1041,6 +1042,11 @@ void netdev_ifdown(FAR struct net_driver_s *dev)
               dev->d_flags &= ~IFF_UP;
             }
         }
+
+      /* Notify clients that the network has been taken down */
+
+      (void)devif_callback_execute(dev, NULL, NETDEV_DOWN,
+                                   dev->d_callbacks);
     }
 }
 

net/netdev/netdev_register.c

@@ -247,6 +247,10 @@ int netdev_register(FAR struct net_driver_s *dev, enum net_lltype_e lltype)
      devfmt = NETDEV_DEFAULT_FORMAT;
 #endif
 
+      /* There are no clients of the device yet */
+
+      dev->d_callbacks = NULL;
+
       /* Get the next available device number and sssign a device name to
        * the interface
        */

net/netdev/netdev_txnotify.c

@@ -166,4 +166,35 @@ void netdev_ipv6_txnotify(FAR const net_ipv6addr_t ripaddr)
 }
 #endif /* CONFIG_NET_IPv6 */
 
+/****************************************************************************
+ * Function: netdev_ipv4_txnotify_dev
+ *
+ * Description:
+ *   Notify the device driver that new TX data is available.  This variant
+ *   would be called when the upper level logic already understands how the
+ *   packet will be routed.
+ *
+ * Parameters:
+ *   dev - The network device driver state structure.
+ *
+ * Returned Value:
+ *  None
+ *
+ * Assumptions:
+ *  Called from normal user mode
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_NETDEV_MULTINIC
+void netdev_ipv4_txnotify_dev(FAR struct net_driver_s *dev)
+{
+  if (dev && dev->d_txavail)
+    {
+      /* Notify the device driver that new TX data is available. */
+
+      (void)dev->d_txavail(dev);
+    }
+}
+#endif /* CONFIG_NET_IPv6 */
+
 #endif /* CONFIG_NET && CONFIG_NSOCKET_DESCRIPTORS */